bytecodeStream.cpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25# include "incls/_precompiled.incl"
26# include "incls/_bytecodeStream.cpp.incl"
27
28Bytecodes::Code RawBytecodeStream::raw_next_special(Bytecodes::Code code) {
29  assert(!is_last_bytecode(), "should have been checked");
30  // set next bytecode position
31  address bcp = RawBytecodeStream::bcp();
32  address end = method()->code_base() + end_bci();
33  int l = Bytecodes::raw_special_length_at(bcp, end);
34  if (l <= 0 || (_bci + l) > _end_bci) {
35    code = Bytecodes::_illegal;
36  } else {
37    _next_bci += l;
38    assert(_bci < _next_bci, "length must be > 0");
39    // set attributes
40    _is_wide = false;
41    // check for special (uncommon) cases
42    if (code == Bytecodes::_wide) {
43      if (bcp + 1 >= end) {
44        code = Bytecodes::_illegal;
45      } else {
46        code = (Bytecodes::Code)bcp[1];
47        _is_wide = true;
48      }
49    }
50  }
51  _code = code;
52  return code;
53}
54